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6. In what kind of situation would you want to perform a test cross? How would you do
it?
7. Suppose that a certain breed of dogs has either floppy or pointy ears, and this trait
is controlled by one gene with two alleles. Pointy ears are dominant over floppy
ears. You have a pointy-eared dog and want to know whether it is homozygous or
heterozygous. What would you do?
8. If you cross a true-breeding homozygous dominant individual with a true-breeding
homozygous recessive individual, what will be the genotypes and phenotypes of the
F1 generation? If you cross the F1 generation with each other, what will be the
genotypes and phenotypes of the F2 generation?
9. In humans, having free earlobes (F) is completely dominant over having attached
earlobes (f). If a man with free earlobes marries a woman with attached earlobes,
and all of their kids have free earlobes, what is most likely the genotype of the
father? Can you be completely sure of the father's genotype? Why or why not?
1. What type of dominance(complete, incomplete, or codominance) best fits the
Blending hypothesis? What type fits the particulate hypothesis?
2. What is a character (a gene)? What is a trait (an allele)? If I say that information at
one locus on a chromosome codes for either blue or orange flowers, can you tell
me what is the gene and what is the allele?
3. What is a genotype? What is a phenotype? If I ask you to write the genotype and
phenotype for a heterozygous flower from one of Mendel's pea plants, can you do
it?
4. What do we mean by P, F1, and F2 generations?
5. What do we mean by "true-breeding" or "pure?" What do we mean by "hybrid?"
What is a monohybrid cross? What is a dihybrid cross?
What is the difference between and exon and an intron?
Definition of mendalslaw, monohybridcrossing,dihybridcrossing
punot squares incomplete dominance cod inaction
multiple allele
Baldness(HB) is dominant in males but recessive in females. The normal gene (Hn)
is dominant in females, but is recessive in males. Explain how a bald offspring can be produced from the mating of normal female with a normal male. Could these parents ever produce a bald girl? Explain.
In a certain species of plants, scented and odourless flowers occur, together with hairy and smooth stems. A scented, smooth-stemmed plant was crossed with a fully homozygous odourless plant with hairy stems. Indicate the possible genotypes and phenotypes of the parents and offspring that would produce four kinds of phenotypes among the offspring, in equal numbers (1:1:1:1). Assume scented and smooth are dominant.
In pea plants, tall plants are dominant over dwarf plants and yellow seed coats are dominant over green seed coats.
a. Complete a punnett square for a cross with a pure-breed tall pea plant that produces yellow seeds and a dwarf pea plant that produces green seeds. List the phenotypic ratio.
b. What would the phenotypic ratios be if you crossed two individuals of the F1 generation?
In a certain species of grasshoppers, the gene(R) for red eyes is dominant to the gene for green eyes(r) and is an autosomal trait. The gene for straight wings(S) is dominant to the gene for curly wings(s) and is sex-linked. The genes are carried on different chromosomes. State the phenotypic ratio of the F1 and F2 if the P1 generation female is homozygous dominant for both traits and the male has green eyes with curly wings.
In drosophila, there is a dominance hierarchy for wing shape.(Curly>Straight>Wavy>Dwarfed).
Show all work including a legend
a. State the phenotypic ratio from a cross with heterozygous wavy winged male with a dwarf winged female.
b. State the phenotypic ratio from a cross with a heterozygous curly winged male who had a dwarfed winged mother, and a straight winged female whose mother was homozygous with wavy wings.
In drosophila, there is a dominance hierarchy for wing shape.(Curly>Straight>Wavy>Dwarfed).
Show all work including a legend
a. State the phenotypic ratio from a cross with heterozygous wavy winged male with a dwarf winged female.
